At various times during seasons thirteen to sixteen Tom Baker sported varying neckwear, tied in a knot at the neck.
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These are known as Ascot Ties and my book The Modern Tailor Outfitter And Clothier dating from 1949 describes how they are cut and tied, accompanied by a series of step-by-step diagrams.
Obviously this is not exactly the same cut as screen worn, but I thought readers might find this interesting period-based reference material.
I think Jon Pertwee wore one of the formally-cut cravats tied that way in The Sea Devils, just not folded over and pinned down.
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